<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>分类参数</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
			</el-alert>

			<!-- 级联选择框区域 -->
			<el-row class="cascader-row">
				<el-col>
					<span>选择商品分类：</span>
					<el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" clearable @change="handleChange">
					</el-cascader>
				</el-col>
			</el-row>

			<!-- Tab 标签页区域 -->
			<el-tabs v-model="activeName" @tab-click="tabToggleHandle">
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加动态参数按钮 -->
					<el-row>
						<el-col>
							<el-button :disabled="isBtnDisabled" size="mini" type="primary" @click="addDialogVisible = true">添加参数</el-button>
						</el-col>
					</el-row>
					<!-- 动态参数表格 -->
					<el-table :data="paramsTableData">
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 参数项中的可选项 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable size="small" @close="removeCurrentTag(i, scope.row)">{{item}}</el-tag>
                <!-- 添加可选项标签 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model.trim="scope.row.inputValue" ref="saveTagInput" size="mini" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
								</el-input>
								<el-button v-else class="button-new-tag" size="mini" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<el-table-column type="index" label="#"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加静态属性按钮 -->
					<el-row>
						<el-col>
							<el-button :disabled="isBtnDisabled" size="mini" type="primary" @click="addDialogVisible = true">添加属性</el-button>
						</el-col>
					</el-row>
					<!-- 静态属性表格 -->
					<el-table :data="attrTableData">
						<el-table-column type="expand">
              <template slot-scope="scope">
								<!-- 参数项中的可选项 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable size="small" @close="removeCurrentTag(i, scope.row)">{{item}}</el-tag>
                <!-- 添加可选项标签 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model.trim="scope.row.inputValue" ref="saveTagInput" size="mini" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
								</el-input>
								<el-button v-else class="button-new-tag" size="mini" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
            </el-table-column>
						<el-table-column type="index" label="#"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加动态参数/静态属性的对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数/属性的对话框 -->
		<el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
  data() {
    return {
      // 所有的分类数据列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 级联选择框选中项的 id 值数组
      selectedCateKeys: [],
      // 当前选中的 tab 标签名称
      activeName: 'many',
      // 动态参数列表
      paramsTableData: [],
      // 静态属性列表
      attrTableData: [],
      // 控制添加参数对话框的展示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改参数对话框的展示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改参数表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取分类数据列表失败！')
      // console.log(res)
      this.catelist = res.data
    },
    // 级联选择器选择项变化时的事件处理函数
    handleChange() {
      this.getParamsData()
    },
    // 获取所有的参数列表数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.paramsTableData = []
        this.attrTableData = []
        return
      }
      // console.log(this.selectedCateKeys)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      // 将服务器响应回来的数据中 attr_vals 的值从字符串转换为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.paramsTableData = res.data
        // console.log(this.paramsTableData)
        return
      }
      this.attrTableData = res.data
    },
    // tab 标签被点击选中时触发
    tabToggleHandle() {
      this.getParamsData()
    },
    // 监听添加对话框关闭的事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数并提交
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.addDialogVisible = false
        this.getParamsData()
        this.$message.success('添加参数成功！')
      })
    },
    //
    async showEditDialog(attrinfo) {
      // 根据 id 查询对应的参数信息
      // const { data: res } = await this.$http.get(`categories${this.cateId}/attributes/${attrinfo.attr_id}`, { params: { attr_sel: this.activeName } })
      // if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
      // this.editForm = res.data
      this.editForm = attrinfo
      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 编辑参数并更新到后台数据库
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('更新参数失败！')
        this.editDialogVisible = false
        this.getParamsData()
        this.$message.success('更新参数成功！')
      })
    },
    // 删除当前的参数
    async removeParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除！')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.getParamsData()
      this.$message.success('删除参数成功！')
    },
    // 参数可选项的文本输入框弹起 enter 键和失去焦点的事件处理函数
    async handleInputConfirm(row) {
      if (row.inputValue === '') return this.$message.info('请输入内容！')
      row.attr_vals.push(row.inputValue)
      row.inputVisible = false
      row.inputValue = ''
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(',')
      })
      if (res.meta.status !== 200) return this.$message.error('更新失败！')
      row.attr_vals = res.data.attr_vals ? res.data.attr_vals.split(',') : []
      // console.log(row)
    },
    // 添加可选项的 tag 按钮
    showInput(row) {
      row.inputVisible = true
      // 待输入框渲染完成后，自动聚焦
      this.$nextTick(() => {
        this.$refs.saveTagInput.focus()
      })
    },
    // 根据索引 i 删除对应的可选值tag标签
    async removeCurrentTag(i, row) {
      row.attr_vals.splice(i, 1)
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(',')
      })
      if (res.meta.status !== 200) return this.$message.error('更新失败！')
      row.attr_vals = res.data.attr_vals ? res.data.attr_vals.split(',') : []
    }
  },
  computed: {
    // 三级分类被选中时，启用添加按钮；反之，则禁用
    isBtnDisabled() {
      return this.selectedCateKeys.length !== 3
    },
    // 被选中时三级分类的 Id 值
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    // 添加参数对话框的标题文本
    titleText() {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cascader-row {
	margin: 15px 0;
}
.el-tag {
	margin: 5px;
}
.button-new-tag {
  margin-left: 5px;
}
.input-new-tag {
  width: 120px;
  margin-left: 5px;
}
</style>
